Cita APA (7a ed.)

Llewellyn, R. (1951). How green was my valley. Penguin Books.

Cita Chicago Style (17a ed.)

Llewellyn, Richard. How Green Was My Valley. Harmondsworth: Penguin Books, 1951.

Cita MLA (9a ed.)

Llewellyn, Richard. How Green Was My Valley. Penguin Books, 1951.